Question: 9. Hostility, continued Refer to Exercise 8. Let A m and B m , respectively, denote the mean scores for the populations of extremely hostile

9. Hostility, continued Refer to Exercise 8. Let A m and B m , respectively, denote the mean scores for the populations of extremely hostile students who could be treated by methods A and B.

a. Find a 95% confidence interval for A m .

b. Find a 95% confidence interval for B m .

c. Find a 95% confidence interval for ( ) A B m 2m .

d. Is it correct to claim that the confidence intervals found in parts

a, b, and

c, are jointly valid?

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